Electric lamp or similar article



Dec. 30, 1952 G. LEIGHTON ELECTRIC LAMP OR SIMILAR ARTICLE Filed Marh 51, 1950 l nven tor: Lew-o5 G.Le i$jl7on,

His A t torney.

Patented Dec. 30, 1952 ELECTRIC LAMP OR SIMILAR ARTICLE .Leroy G. Leighton, Lyndhurst, Ohio, assignor to General Electric Company, a corporation of New York Application March 31, 1950, Serial No. 153,217

Claims.

1 My invention relates in general to electric incandescent lamps or similar electrical devices containing a filament or other electric energy trans- V lation element which. is to be heated during the operation of the device. More particularly, my invention relates to a heat deflector arrangement for such devices.

Incertain types of electric incandescent lamps, particularly of the high-wattage gas-filled type, it is customary to mount a heat deflector element or disc in the neck of the lamp bulb for the purpose of breaking up the heat convection currents in the bulb to prevent overheating of those parts of the lamp, such as the base, basing cement and stem, at the base end of the lamp. Heretofore, such heat deflector discs have been supported either by means of the inner leads of the lamp, in whichcase the discs must either be made of an insulating material or provided with auxiliary insulating parts to prevent short-circuiting of the .wires, or on the stem of the lam mount with the use of auxiliary parts to retain the disc in place thereon, and the assembly of such prior type discs on the lamp mount has been more or less inconvenient and time consuming.

2 The stem 3 is formed with a press portion 4 through which are sealed a pair of leading-in conductors or wires 5, 5 connected at their outerends to the terminals 6, l of a conventional type lamp base 3 cemented or otherwise suitably secured to the neck end of the lamp envelope I. At their inner ends the leading-in conductors 5, 5 are connected to the opposite ends of an electric energy translation element or filament 9, such as a coiled tungsten wire for instance, which is heated during the operation of the lamp. In the particular case shown, the filament 9 is supported at points intermediate its length by a plu rality of auxiliary support wires It which are anchored in an insulating support rod or glass arbor ll extending inwardly of the envelope from the and filled with a suitable gas, such as argon or It is one object of my invention therefore to mount without the need of any additional parts to retain it in place thereon. Another object of my invention is to provide a supporting arrangement for a heat deflector element of an electric incandescent lamp or similar device which enables the use of an inexpensivemetallic disc for the heat deflector element. -In accordance with the invention, the heat deflector element of an electric incandescent lamp is formed of a thin disc of metal provided with a slot which extends radially inward from its periphery and the sides of which have laterally bent tongues or flanges-which slidably fit more or less tightly over the stem press of the lamp mount, within parallel grooves formed in the opposite press surfaces of the stem press, to therebysl pport thev disc in place on the stem.

"Further objects and advantages of my invention will appear from thefollowing detailed description of a species thereof and from the accompanying drawing.

In the drawing, Fig. l is an elevation of an electric incandescent lamp comprising my invention; Fig. 2 is an exploded fragmentary perspective view of the stem portion of the lamp; and Fig. 3 is a fragmentary elevation of the stem at right angles to Fig. 1. 1 Referring to the drawing, the incandescent lamp there shown comprises a sealed glass envelope or bulb I having a neck portion 2 provided witha reentrant stem 3 which is sealedthereto.

nitrogen, or mixtures thereof, through a glass exhaust tube l2 which extends from the stem press 41 and communicates with the interior of the envelope and which is afterwards tipped-01f in the usual manner to hermetically seal the en-, velope I. 7

Mounted in the neck 2 of the envelope, in posie tion to break up the heat convection currents in the envelope and reflect the heat radiations from the filament 9 so as to prevent overheating of the base end of the lamp, is a reflecting heat deflector element or disc 13 according to the in vention. The deflector disc is is mounted on the stem 3 and is in the form of a stamping made i of a suitable metal, such as aluminum or nickel In accordance with the invention, the deflector disc [3 is mounted on the press portion 4 of the stem 3. For this purpose the disc 53 is; provided with a radially extending slot i4 extending in-- ward from the edge [5 of the disc and which is adapted to receive the stem press 4 therein; The slot [4 is of a length sufficient to permit centering of the disc on the stem 3. The disc slides onto the stem press .4 in small slots or grooves it which are molded in the opposite sides I1, I 8 of the press 4 at stem making and extend straight across the press transverse to the axisof the stem 3, and the sides or edges IQ of the disc slot id have a more or less tight sliding fit with the bottoms of the grooves It in the stem press. The grooves it have a width (around inch in the particular case illustrated) appreciably greater than the thick-- ness of the material of which the disc i3 is made, and they are formed with relatively sharp corners at their bottoms. disc I3 in transverse position on the stem 3 To effectively support the.

against tilting, the disc is formed with tongues or ears 28- which are bent at right angles to the plane of the disc and extend along the sides IQ of the slot M at the central region of the disc. The tongues are of a height corresponding to the width of the grooves 16 in the stem press and they are received and locked in thesaid grooves with a tight sliding fit between the slides 21 thereof, thereby effectively supporting the disc in place on the stem in a plane transverse to the axis thereof.

To assemble the disc I3 on the stem '3 of the lamp mount, it is merely necessary to slide the slotted portion M of the disc into the grooves IS in the stem press until the disc is centered on the stem with the bent tongues or ears 26 received and locked within the said grooves. Such an assembly operation obviously is simple and quick, andcan be performed with a minimum amount of effort and without the need of any additional parts. This, coupled with the relatively low cost of the disc itself, results in a very inexpensive heat deflector arrangement.

Although a preferred embodiment of my invention has been disclosed, it will be understood that the invention is not to be limited to the specific construction and arrangement of parts shown, but that they may be widely modified within the spirit and scope of my invention as defined by the appended claims.

What I claim as new and desire to secure by Letters Patent of the United States is:

-1. An electric lamp orsimilar device comprising an envelope having a reentrant stem provided with a press portion, an electric energy translation element in said envelope, leading-in conductors connected to said translation element and having portions sealed and embedded in the said press portion of the stem, at least one of the press surfacesof said stem press having a straight groove therein extending thereacross transversely'to the axis-of the stem, and a heat deflector element on said stem having a slot extending inward from its periphery, the slot edge portions of the deflector being slidably fitted tightly over the said stem press within and tightly against the walls of the said groove therein to firmly support the deflector in place on said stem press in a plane transverse to the stem axis.

2. -An electric lamp or similar device comprising'an envelope having areentrant stem provided with a press portion, an electric energy translation element in said envelope, leading-in conductors connected to said translation element and having portions sealed and embedded in the said press portion of the stem, said stem press having parallel grooves in its opposite press surfaces extending thereacross transversely to the axis of-the stem, and a heat deflector disc on said stem having a slot extending inward from its periphery, the slot edge portions of the disc being slidably fitted tightly over the said stem press within and tightly against the walls of the said-grooves therein to firmly support the disc in'pl'ace on said stem press in a plane transverse to the "stem axis, said slot being of a length sulfic'ien't toaccommodate the "stem press centrally of the disc.

3. An electric lamp or similar device comprising an envelope havin a reentrant stem provided with a press portion, an electric energy translation element in said envelope, leading-in conductors connected to said translation element and havin portions sealed and embedded in the said press portion of the stem; saidstem press having 4 parallel grooves in its opposite press surfaces extending thereacross transversely to the axis of the stem, and a thin metal heat deflector disc on said stem having a slot extending inward from its periphery and the sides of which slidably fit tightly over the said stem press within the said grooves therein, at least one of said grooves having "a width appreciably greater than the thickness of said disc, and said disc having a tongue extending transversely of the plane thereof and slidably fitting tightly Within and between the sides of said one groove to firmly support the disc in place on said stem press in a plane transverse to the stem axis.

4. An electric lamp or similar device comprising an envelope having a reentrant stem provided with a press portion, an electric energy translation element in said envelope, leading-in conductors connected to said translation element and having portions sealed and embedded in the said Dress portion of the stem, said stem press having parallel grooves in its opposite press surfaces extending thereacross transversely to the axis of the stem, anda thin metal heat deflector disc on said stem having a slot extending inward from its periphery and the sides of which slidably fit tightly over the said stem press within the said grooves therein, said grooves having a width appreciably greater than the thickness of said disc, and said disc having bent tongues extending transversely of said disc from the side edges of said slot and slidably fitting tightly Within and between the sides of the respective rooves in said stem press to firmly support the disc in place thereon in a plane transverse to the stem axis.

5. An electric lamp or similar device comprising an envelope having a re-entrant stem provided with a flattened press portion, an electric energy translation element in said envelope, leading-in conductors connected to said translation element and having portions sealed and embedded in the said press portion of the stem, said stein press having parallel grooves in its opposite press surfaces extending thereacross transversely to the axis of the stern, and a metallic heat deflector disc mounted on and embracing said stem press and'provided with a slot therein extending inwardly from its periphery for assembly of the disc on said stem press by a slidi'ngmovement-of the slotted portion of the disc into the said grooves in the stem press, said slot being proportioned to snugly receive the grooved portion of the stem press therein so that the slot edges frictionally engage the walls of said grooves to thereby firmly support the disc in place on said stempress in a plane transverse to the stem axis.

LEROY G. LEIGHTON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,270,355 Mailey July 2, 1918 1,293,781 Hoyt Feb. 11, 1919' 1,570,716 Donovan May 22 1928' 1,771,957 Hamner July 29, 1930 1,899,587 Quesseque Feb. 28 1933 1,955,510 Mukas Apr. 17, 1934 2,117,039 Rook May 10 1938 2,142,104 Birdseye Jan. 3 1939 2,232,816 Van Horn Feb. 25 1941 2,288,499 Van Horn June 30, 1.942 

